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mcp-developer

Use when building, debugging, or extending MCP servers or clients that connect AI systems with external tools and data sources. Invoke to implement tool handlers, configure resource providers, set up stdio/HTTP/SSE transport layers, validate schemas with Zod or Pydantic, debug protocol compliance issues, or scaffold complete MCP server/client projects using TypeScript or Python SDKs.

72

Quality

91%

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SKILL.md
Quality
Evals
Security

Quality

Content

85%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

A well-structured body: a sequenced six-step workflow with explicit validation and feedback loops, a clearly signaled one-level-deep reference bundle (verified against actual files), and near-executable TypeScript/Python examples. The main gaps are minor: placeholder helper functions and a missing import keep the examples from being copy-paste runnable, and a few generic constraint bullets plus attribution lines could be trimmed.

DimensionReasoningScore

Conciseness

Mostly efficient — no concept-teaching padding, code comments are minimal, and detail is pushed to reference files. Not 5: a persona sentence ("Senior MCP... developer with deep expertise"), maintainer/docs attribution lines, and generic bullets ("Implement comprehensive error handling", "Test protocol compliance thoroughly") are tokens that don't earn their place. Not 3: there are only minor trimmable instances, not several padded sections.

4 / 5

Actionability

Mostly executable: real scaffold/test commands ("npx @modelcontextprotocol/create-server my-server", "npx @modelcontextprotocol/inspector") and genuine SDK code (McpServer, StdioServerTransport, FastMCP). Not 5: examples are not copy-paste ready — undefined helpers ("fetchWeather(location, units)", "// your fetch logic", "getConfig()") and a missing "import json" in the Python example are minor gaps. Not 3: the code is real, near-complete, and not pseudocode.

4 / 5

Workflow Clarity

The six-step Core Workflow has an explicit validation step ("Run npx @modelcontextprotocol/inspector to verify protocol compliance interactively") and two concrete feedback loops ("if schema validation fails → inspect Zod/Pydantic error output → fix schema definition → re-run inspector"; "malformed response → check transport serialisation → fix handler → re-test"), with MUST DO / MUST NOT DO lists acting as checklists. Not 4: checkpoints are explicit, not implicit.

5 / 5

Progressive Disclosure

All five referenced files (protocol.md, typescript-sdk.md, python-sdk.md, tools.md, resources.md) exist in references/ and are one level deep (no nested references inside them). The Topic/Reference/"Load When" table gives clear navigation signals, and the body keeps only a minimal working example inline with bulk detail split into files. Not 4: navigation is unambiguous and the split is appropriate throughout.

5 / 5

Total

18

/

20

Passed

Description

92%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A strong description: it explicitly states both what the skill does and when to use it, enumerates concrete actions across the full MCP development lifecycle, and names specific technologies (Zod, Pydantic, stdio/HTTP/SSE, TypeScript/Python SDKs). Its only weakness is slightly incomplete natural-term coverage — the spelled-out "Model Context Protocol" synonym is absent.

DimensionReasoningScore

Specificity

Lists multiple concrete actions with comprehensive lifecycle coverage: "implement tool handlers, configure resource providers, set up stdio/HTTP/SSE transport layers, validate schemas with Zod or Pydantic, debug protocol compliance issues, or scaffold complete MCP server/client projects using TypeScript or Python SDKs" — specific technologies are named throughout. Not 4: coverage spans building, debugging, extending, and scaffolding with no notable gaps.

5 / 5

Completeness

Explicitly answers both: the "what" ("implement tool handlers, configure resource providers, set up stdio/HTTP/SSE transport layers, validate schemas...") and the "when" ("Use when building, debugging, or extending MCP servers or clients..."). Not 4: the "when" clause is explicit and specific with concrete trigger situations, not generic.

5 / 5

Trigger Term Quality

Good natural keyword coverage — "MCP servers or clients", "building, debugging, or extending", "Zod or Pydantic", "stdio/HTTP/SSE", "TypeScript or Python SDKs" — which users would naturally say. Not 5: a few natural terms are missing, notably the spelled-out "Model Context Protocol" synonym and phrasings like "MCP integration" or "connect Claude to tools".

4 / 5

Distinctiveness Conflict Risk

"MCP servers or clients", "protocol compliance", and the Zod/Pydantic/SDK specifics define a clear niche with distinct triggers; minimal conflict risk with generic TypeScript/Python skills. Not 4: the MCP anchor is specific enough that overlap risk is negligible.

5 / 5

Total

19

/

20

Passed

Validation

100%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository

Jeffallan/claude-skills

Path

skills/mcp-developer/SKILL.md

Reviewed

Table of Contents

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